WO2004089220A1 - Sonde echographique et dispositif de diagnostic echographique utilisant ladite sonde - Google Patents

Sonde echographique et dispositif de diagnostic echographique utilisant ladite sonde Download PDF

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Publication number
WO2004089220A1
WO2004089220A1 PCT/JP1997/004218 JP9704218W WO2004089220A1 WO 2004089220 A1 WO2004089220 A1 WO 2004089220A1 JP 9704218 W JP9704218 W JP 9704218W WO 2004089220 A1 WO2004089220 A1 WO 2004089220A1
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WO
WIPO (PCT)
Prior art keywords
ultrasonic
probe
shape
image
transducers
Prior art date
Application number
PCT/JP1997/004218
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English (en)
Japanese (ja)
Inventor
Katsunori Asahusa
Original Assignee
Katsunori Asahusa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Katsunori Asahusa filed Critical Katsunori Asahusa
Priority to US09/308,381 priority Critical patent/US6299580B1/en
Publication of WO2004089220A1 publication Critical patent/WO2004089220A1/fr

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/32—Sound-focusing or directing, e.g. scanning characterised by the shape of the source
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
    • B06B1/0622—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements on one surface
    • B06B1/0637—Spherical array
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
    • G01N29/0609—Display arrangements, e.g. colour displays

Definitions

  • the present invention relates to an ultrasonic probe capable of improving a directivity of an ultrasonic transmission beam by reducing a grating rope at the time of launching an ultrasonic wave, and an ultrasonic probe.
  • the present invention relates to an ultrasonic diagnostic apparatus used as a probe for transmitting and receiving ultrasonic waves to and from a diagnostic site in a subject.
  • a conventional ultrasonic probe includes a plurality of transducers that emit ultrasonic waves and receive reflected echoes thereof, and are provided on the back of the transducers so that ultrasonic waves emitted from the transducers do not return again.
  • An acoustic matching layer provided on the front surface of the vibrator to match the difference between the acoustic impedance of the vibrator and the acoustic impedance of a living body; and an ultrasonic beam provided on the upper surface of the acoustic matching layer.
  • an acoustic lens for converging light.
  • the plurality of transducers are formed in a strip shape, and a number of the strip-shaped transducers are arranged linearly in one dimension, or arranged in a large number in two dimensions, or the ultrasonic transmitting and receiving surface after the arrangement in a large number is circular.
  • An ultrasonic probe was formed side by side so as to form an arc.
  • an ultrasonic transmission beam and an ultrasonic reception beam driven by the ultrasonic probe are combined. That is, by adding a time-delayed transmission signal to the vibrator, an ultrasonic transmission beam that converges the ultrasonic wave at a certain point is formed, and the reflected echo signal received by the vibrator is reflected.
  • an ultrasonic receiving beam was formed.
  • the slice thickness of the tomographic image was controlled by refocusing the ultrasonic beams in the short-axis direction of the many transducers by using an acoustic lens or the like.
  • the number of scanning lines of the ultrasonic beam is increased, the running time is improved and the ultrasonic wave is improved.
  • the resolution of the image was improved.
  • two-dimensional scanning of an ultrasonic beam is performed a plurality of times in a slice direction with respect to a subject.
  • the beam is directed to the ultrasonic transmission beam.
  • ultrasonic waves called a grating rope are generated in the horizontal direction, and the directivity of the ultrasonic transmission beam may be degraded. Due to the existence of such a grating rope, if a plurality of ultrasonic receiving beams are used and the number of ultrasonic beams is increased, a difference in sensitivity occurs between the ultrasonic beams. This difference in sensitivity may limit the number of ultrasonic receiving beams and limit the frame rate of the obtained ultrasonic image.
  • the present invention addresses such a problem, and reduces the grating aperture during ultrasonic launch, thereby improving the directivity of the ultrasonic transmission beam, and It is an object of the present invention to provide an ultrasonic diagnostic apparatus that uses this ultrasonic probe as a probe that transmits and receives ultrasonic waves toward a diagnostic site in a subject.
  • an ultrasonic probe includes a plurality of transducers for emitting ultrasonic waves and receiving the reflected echoes, and has a backing material on the back surface of the transducers, An ultrasonic probe having an acoustic matching layer and an acoustic lens on the front surface thereof, wherein the transducers are arranged in a spherical shape.
  • a plurality of transducers for emitting ultrasonic waves and receiving the reflected echoes are provided, a backing material is provided on the back face of the transducer, and an acoustic matching layer and an acoustic lens are provided on the front face thereof.
  • the vibrator is formed in a small block shape having a predetermined shape, and a large number of the small block-shaped vibrators are formed on a front side of a packing material formed in a spherical shape protruding in a hemispherical shape. Are arranged in a spherical shape.
  • the vibrator is formed in a disc shape or a polygon plate shape, and only the disc shape, or only the polygon plate shape, or a combination of the disc shape and the polygon plate shape is used. They may be used and arranged in a spherical shape.
  • an ultrasonic diagnostic apparatus as a related invention has a structure in which a plurality of transducers are arranged and A probe for transmitting / receiving ultrasonic waves to / from a transmitter, a transmission unit for transmitting a transmission signal of ultrasonic emission to each transducer in the probe, and amplifying and adjusting a reflection echo signal from the probe.
  • a receiving unit that performs phase addition, a signal processing unit that performs signal processing on a signal received from the receiving unit, an image storage unit that converts the processed received signal into image data, performs image processing, and stores the image data
  • An ultrasonic diagnostic apparatus comprising: a display unit that displays image data from the image storage unit; a control unit that controls the operation of each of the above components; and an input unit that inputs an operation command to the control unit.
  • the ultrasonic probe of the above-described means is used as the probe, and a transmission signal having the same phase is transmitted from the transmitting unit to a number of transducers constituting the probe, thereby providing directivity.
  • a sound field equivalent to a point source that does not It is obtained by enabling generate re simultaneously a plurality of receive beams by the received signal from the child.
  • the image storage unit may include a frame memory that stores image data for simultaneously displaying at least two or more two-dimensional tomographic images or image data for displaying a three-dimensional image. .
  • FIG. 1 is a perspective view showing an embodiment of an ultrasonic probe according to the present invention.
  • FIG. 2 is a perspective view showing another embodiment of the ultrasonic probe.
  • FIG. 3 is an explanatory diagram showing the state of propagation of ultrasonic waves by the ultrasonic probe.
  • FIG. 4 is an explanatory diagram showing the directivity of an ultrasonic transmission beam by a disk-shaped vibrator.
  • FIG. 5 is an explanatory diagram showing directivity of an ultrasonic transmission beam by a square plate-shaped vibrator.
  • FIG. 6 is a block diagram showing an ultrasonic diagnostic apparatus as a related invention of the ultrasonic probe.
  • FIG. 7 is a block diagram showing the internal configuration of the transmission unit.
  • FIG. 8 is a block diagram showing another example of the internal configuration of the transmission unit.
  • FIG. 9 is a block diagram showing the internal configuration of the phasing unit in the receiving unit.
  • FIG. 10 is an explanatory diagram showing the internal configuration of the image storage unit.
  • FIG. 1 is a perspective view showing an embodiment of an ultrasonic probe according to the present invention.
  • the ultrasonic probe 1 serves as a measuring unit that transmits and receives ultrasonic waves to and from the subject in an ultrasonic diagnostic apparatus that obtains an ultrasonic image of a diagnostic site in the subject using ultrasonic waves.
  • a plurality of transducers 2, 2,... For emitting ultrasonic waves and receiving the reflected echoes are provided, and a backing material 3 is provided on the back of the transducer 2 and the front face thereof is provided.
  • a material such as ZnO or PZT is used as a piezoelectric element, electrodes are provided on both sides of the piezoelectric element, and a voltage is applied between both electrodes. When applied, the piezoelectric element expands and contracts in the thickness direction.
  • the backing material 3 is provided on the back surface of the vibrator 2 so as to prevent the ultrasonic wave from the vibrator 2 from returning again, and uses a material having a large attenuation of the ultrasonic wave.
  • the acoustic matching layer is provided on the front surface of the vibrator 2 to match the difference between the acoustic impedance of the vibrator 2 and the acoustic impedance of a living body.
  • the vibrator 2 is formed in a small block shape having a predetermined shape, and a large number of the small block-shaped vibrators 2, 2,.
  • the packing material 3 is arranged in a spherical shape on the front side. That is, as shown in FIG. 1, the vibrator 2 is formed in a disk shape having a diameter of several ⁇ to several mm. Alternatively, as shown in FIG. 2, it is formed in the shape of a polygonal plate having one side to several mm, for example, a hexagonal plate.
  • a thin film can be formed by sputtering and then cut. As shown in FIGS.
  • the front surface of the packing material 3 is formed as a hemispherically projecting spherical surface.
  • the large number of vibrators 2, 2, ... are arranged in a spherical shape.
  • mounting is performed by an automatic chip mounting machine, and wire bonding is applied to the terminal on the backing material 3 side.
  • FIG. 1 only a large number of disk-shaped vibrators 2 are arranged in a spherical shape, and in FIG. 2, only a large number of polygonal plate-shaped vibrators 2 are arranged in a spherical shape.
  • the present invention is not limited thereto, and the disk-shaped vibrators 2 and the polygonal plate-shaped vibrators 2 may be alternately arranged and combined, and may be arranged in a spherical shape as a whole.
  • the above-described plurality of transducers 2, 2, By transmitting the transmission signal, as shown in FIG. 3 (a), the ultrasonic waves 4, 4,... Having a specific directivity are transmitted from the transducers 2, 2,. At this time, the ultrasonic waves 4, 4,... are transmitted radially from each of the transducers 2, 2,... as a whole. Focusing on the peaks and valleys of the sound pressure of the ultrasonic waves 4 at that time, the transducers 2, 2, The wavefront 5 propagates sequentially in a concentric circle centered on the center of the spherical surface on which... Are arranged. As a result, as shown in FIG.
  • the point sound source 7 is equivalent to the state where the point sound source 7 exists at the center of the spherical surface 6 on which the oscillators 2, 2,. uniformly, however c ultrasound 8 and is transmitted, in practice, there is a directivity in ultrasonic transmission beams from the vibrator 2, as described above.
  • FIGS. 4 and 5 show how the directivity changes depending on the shape of the vibrator 2.
  • FIG. 4 shows the directivity in the case of the disk-shaped vibrator 2.
  • the diameter of the disk-shaped vibrator 2 is d
  • the wavelength of the ultrasonic wave to be emitted is L
  • FIG. 5 shows the directivity in the case of the transducer 2 having a polygonal plate shape.
  • the length of one side of the square plate-shaped vibrator 2 ' is a
  • the wavelength of the ultrasonic wave to be launched is ⁇
  • the main rope 9 From the center of Assuming that the azimuth is ⁇ , the factor Z of the Bessel function J is expressed by the following equation (3) .
  • the directivity function R indicating the height of the main rope 9 is expressed by the following equation (4). Is represented by
  • the directivity can be improved as the intervals between the transducers 2 are closer, the aperture of the transducer is smaller, and the number of transducers is larger. Therefore, according to the ultrasonic probe 1 of the present invention, by applying and driving a transmission signal, the sound pressure of the transmitted ultrasonic wave is evenly propagated in all directions, and the point sound source transmission is performed. Make it possible. By making the arrangement interval of the vibrator 2 close, the main lobe can be evenly propagated in all directions in which the main lobe is folded, and the point sound source can be transmitted.
  • the shape of the vibrator 2 may be a disk or a regular polygon, and the vibrators 2 may be arranged at regular intervals.
  • the delay amount data in one direction can be shared with the delay amount data in the other direction, so that the number of data and the amount of operation can be reduced, the circuit size of the device can be reduced, and the processing speed can be increased and the processing speed can be increased.
  • the frame rate can be increased.
  • FIG. 6 is a block diagram showing an ultrasonic diagnostic apparatus as a related invention of the ultrasonic probe.
  • This ultrasonic diagnostic apparatus collects and displays a tomographic image of a diagnostic site in a subject using ultrasonic waves, and as shown in FIG. 6, a probe 1, a transmitting unit 11, Receiving unit 12, Signal processing unit 13, Image storage unit 14, Display unit 15, Control unit 16 And input means 17.
  • the probe 1 transmits and receives an ultrasonic wave into a subject, and has a plurality of transducers arranged therein.
  • the transmitting unit 11 transmits a transmission signal of ultrasonic emission to each transducer in the probe 1, and includes therein a basic clock generator 18 as shown in FIG. 7 or FIG. , A transmission signal timing section 19, a transmission signal generation section 20, and an amplifier 21.
  • the receiving unit 12 amplifies the reflected echo signal from the probe 1, performs A / D conversion, performs phasing addition, and further performs filtering, detection, LOG compression, and the like.
  • the phase shifter has a phasing section including a signal delay section 22 and an addition section 23.
  • the signal processing unit 1 3 is for signal processing the received signals from the receiving unit 1 2, main Dian, FFT, c image storage unit 1 4 adapted to filter the like, such as smoothing, the
  • the signal processing unit 13 converts the received signal after processing into image data, performs image processing, and stores the image data.
  • the image data is stored in an image storage memory such as a RAM.
  • the display unit 15 displays the image data from the image storage unit 14 and includes an image encoder, a CRT, and the like.
  • the control unit 16 controls the operation of each of the above components, and is composed of, for example, a CPU (Central Processing Unit). Further, the input means 17 is for inputting an operation command to the control section 16 and comprises a button, a switch, a trackball, a mouse, a touch panel, etc. for inputting various parameters at the time of operating and controlling the apparatus. .
  • a CPU Central Processing Unit
  • the input means 17 is for inputting an operation command to the control section 16 and comprises a button, a switch, a trackball, a mouse, a touch panel, etc. for inputting various parameters at the time of operating and controlling the apparatus. .
  • the ultrasonic probe 1 shown in FIG. 1 or FIG. 2 is used as the probe 1, and a number of transducers 2, 2,.
  • the transmitting section 11 transmits the same phase transmission signal to generate a sound field equivalent to a point source having no directivity, and the receiving section 12 simultaneously receives the received signal from the probe 1 simultaneously. It is possible to generate multiple receive beams.
  • FIG. 7 is a block diagram showing the internal configuration of the transmission unit 11.
  • the basic clock generator 18 generates a sampling clock for generating a transmission signal to the probe 1, and includes, for example, an oscillator such as a crystal, a counter, a frequency divider, and the like.
  • the transmission signal timing section 19 receives the output signal from the basic clock generator 18 It generates timing for generating a transmission signal to the probe 1 by force, and includes, for example, storage means such as ROM and RAM, a counter, a frequency divider, and the like.
  • the transmission signal generation unit 20 receives the output signal from the transmission signal timing unit 19 and generates a transmission signal for the probe 1, and includes, for example, storage means such as ROM and RAM, and DZA.
  • the amplifier 21 receives and amplifies the output signal from the transmission signal generator 20 and outputs the transmission signal to the probe 1, and includes, for example, a transistor, a FET, an operational amplifier, and a buffer memory. Have been.
  • the transmission unit of the conventional ultrasonic diagnostic apparatus using the ultrasonic probe generates transmission signal timings corresponding to the number of transducers for transmitting ultrasonic waves, and generates and amplifies a plurality of transmission signals.
  • the amplifier 21 corresponding to the number of transducers N of the probe 1 can be increased. What is necessary is just to supply transmission signal timing of the same phase.
  • the transmission signal timing is in phase as described above, as shown in FIG. 8, only one amplifier 21 may be provided as long as it can drive the vibrator.
  • FIG. 9 is a block diagram showing a phasing unit in the receiving unit 12.
  • the signal delay unit 22 delays a plurality of received signals received by a plurality of transducers of the probe 1 and adjusts their phases, and includes a delay element such as an LC delay line or an RC delay line, or a digital delay circuit. It consists of a memory such as RAM and a selector.
  • the adder 23 adds the received signal from the signal delayer 22 and is composed of an operational amplifier, a transistor or a DSP, a digital adder, and the like.
  • the example of FIG. 9 shows a case where three ultrasonic receiving beams are generated.
  • the signal delay unit 22 includes three delay element groups each including a plurality of delay elements (24a, 24). b, 24c) are provided to control the amount of delay for each direction of the received signal to control the direction of the received beam. Then, the reception signals phased by the respective delay element groups 24a, 24b, 24c are set.
  • the signals are added by the three adders 23, respectively, to generate ultrasonic receiving beams in three directions.
  • the number of obtained ultrasonic receiving beams increases, and the frame rate and resolution of the ultrasonic image are improved. I can do it.
  • an ultrasonic three-dimensional image can be obtained by simultaneously scanning the ultrasonic receiving beam in the two-dimensional direction.
  • an ultrasonic tomogram having a sharp slice thickness in the short-axis direction can be obtained by scanning the ultrasonic receiving beam in a one-dimensional direction and narrowing the ultrasonic receiving beam in the scanning direction and the 90-degree direction. be able to.
  • the ultrasonic tomographic image in the short-axis direction can be obtained. Can be obtained.
  • FIG. 10 is an explanatory diagram showing the internal configuration of the image storage unit 14.
  • Image data for displaying at least two or more two-dimensional tomographic images or image data for displaying a three-dimensional image at the same time. Is stored in the frame memory. More specifically, it includes a pre-memory 25, an image processing unit 26, and a post-memory 27.
  • the pre-memory 25 stores the received signal data, setting status, comments, scale and other diagnostic parameters, and body mark and other character data that are the basis of the diagnostic image data. And the like.
  • the image processing unit 26 performs image processing such as inter-frame processing, filter processing, coordinate conversion processing, enlargement or reduction, etc.
  • the post memory 27 stores the image data processed by the image processing unit 26 and outputs it to the display unit 15 at the subsequent stage, and is composed of a storage medium such as a ROM, a RAM, and a hard disk.
  • the ultrasonic receiving beam is scanned at least simultaneously in two linear scans or three-dimensional scan. And simultaneously display at least two two-dimensional tomographic images
  • a plurality of tomographic images can be displayed by having a frame memory for storing image data for the purpose.
  • the receiving unit 12 and the image storage unit 14 simultaneously scan the ultrasonic receiving beam in the three-dimensional direction, and perform image processing for displaying the three-dimensional image.
  • a three-dimensional image such as a bird's-eye view can be displayed.
  • an ultrasonic tomographic image such as a B image and a C image, a cine photographed image, a fluoroscopic image, and the like can be obtained.
  • Two-dimensional images can be displayed.
  • a vibrator in an ultrasonic probe, a vibrator is formed in a small block shape having a predetermined shape, and a large number of small block-shaped vibrators are formed in a spherical shape projecting in a hemispherical shape.
  • the sound pressure of the transmitted ultrasonic wave is increased in all directions by applying a transmission signal of the same phase to the many vibrators and driving it, arranged in a spherical shape on the front side of the formed packing material. , And point sound sources can be transmitted.
  • the transducer of the ultrasonic probe is formed in a disk shape or a polygonal plate shape, and only a disk shape or a polygon shape only, or a disk shape and a polygon shape are formed.
  • a spherical arrangement using a combination of the two it is possible to improve the directivity of the ultrasonic transmission beam by reducing the grating globe at the time of ultrasonic emission. Therefore, even if the number of ultrasonic beams is increased, the sensitivity difference does not substantially occur, the number of ultrasonic receiving beams is not limited, and a high frame rate of the obtained ultrasonic image can be achieved.
  • an ultrasonic diagnostic apparatus as a related invention of the above ultrasonic probe uses the ultrasonic probe shown in FIG. 1 or FIG. 2 as the probe, and includes a large number of components constituting the probe.
  • the transmitter transmits the same phase transmission signal to the transducer to generate a sound field equivalent to a point sound source without directivity, and the receiver receives multiple signals simultaneously from the probe.
  • the sound pressure of the transmitted ultrasonic wave propagates evenly in all directions, enabling point source transmission and reducing the number of ultrasonic beams. Even if the sensitivity difference does not occur, the number of ultrasonic receiving beams is not limited, and the obtained ultrasonic image can have a high frame rate.
  • the image storage unit of the ultrasonic diagnostic apparatus may include a frame memory that stores image data for displaying at least two or more two-dimensional tomographic images or image data for displaying a three-dimensional image.
  • a plurality of tomographic images can be displayed, and at the same time, the ultrasonic receiving beam is simultaneously scanned in a three-dimensional direction to perform image processing for displaying a three-dimensional image, thereby realizing a cinematic image. It can display three-dimensional images such as shooting, transmission, and bird's-eye view.
  • two-dimensional images such as an ultrasonic tomographic image such as a B image and a C image, a cine photographed image, and a fluoroscopic image can be obtained.
  • a dimensional image can be displayed.

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  • Acoustics & Sound (AREA)
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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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Abstract

L'invention concerne une sonde échographique améliorée du point de vue de la directivité du faisceau d'émission ultrasonores, par la réduction du lobe de périodicité lorsque des ondes ultrasonores sont émises. La sonde échographique (1) selon l'invention comporte une pluralité d'oscillateurs (2) émettant des ondes ultrasonores et recevant en même temps des échos réfléchis. Ladite sonde comprend également un matériau de support (3) disposé au dos desdits oscillateurs (2), ainsi qu'une couche de correspondance acoustique et une lentille acoustique disposées sur l'avant de ces oscillateurs. Ces derniers sont formés dans de petits blocs présentant une forme prédéterminée. De nombreux oscillateurs (2) sous forme de petits blocs sont disposés de manière sphérique sur le côté avant du matériau de support (3) formé sur un plan sphérique faisant saillie comme un hémisphère. Cette structure permet, par l'application de signaux d'envoi de phase identique vers les nombreux oscillateurs et par l'entraînement de ces derniers, que les pressions sonores des ondes ultrasonores émises se propagent uniformément dans toutes les directions, ce qui permet la transmission de la source sonore ponctuelle et la réduction du lobe de périodicité lors de l'émission des ondes ultrasonores. La directivité du faisceau d'ondes ultrasonores émis est ainsi améliorée.
PCT/JP1997/004218 1996-11-19 1997-11-19 Sonde echographique et dispositif de diagnostic echographique utilisant ladite sonde WO2004089220A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09/308,381 US6299580B1 (en) 1996-11-19 1998-06-17 Ultrasonic probe and ultrasonic diagnostic apparatus using the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8/307627 1996-11-19
JP30762796A JP3862793B2 (ja) 1996-11-19 1996-11-19 超音波探触子及びそれを用いた超音波診断装置

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WO2004089220A1 true WO2004089220A1 (fr) 2004-10-21

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US (1) US6299580B1 (fr)
JP (1) JP3862793B2 (fr)
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